This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Framework 6.1.12! |
Inline Maps
You can also directly express maps in an expression by using {key:value}
notation. The
following example shows how to do so:
-
Java
-
Kotlin
// evaluates to a Java map containing the two entries
Map inventorInfo = (Map) parser.parseExpression("{name:'Nikola',dob:'10-July-1856'}").getValue(context);
Map mapOfMaps = (Map) parser.parseExpression("{name:{first:'Nikola',last:'Tesla'},dob:{day:10,month:'July',year:1856}}").getValue(context);
// evaluates to a Java map containing the two entries
val inventorInfo = parser.parseExpression("{name:'Nikola',dob:'10-July-1856'}").getValue(context) as Map<*, *>
val mapOfMaps = parser.parseExpression("{name:{first:'Nikola',last:'Tesla'},dob:{day:10,month:'July',year:1856}}").getValue(context) as Map<*, *>
{:}
by itself means an empty map. For performance reasons, if the map is itself
composed of fixed literals or other nested constant structures (lists or maps), a
constant map is created to represent the expression (rather than building a new map on
each evaluation). Quoting of the map keys is optional (unless the key contains a period
(.
)). The examples above do not use quoted keys.